14 to 15 weeks and they can tell if your having a boy. Ots kinda hard to miss
I was 15 weeks u can definitely see his boy parts
I went at 14 weeks with my first and they had a hard time telling, im going at 21weeks for my anatomy scan this time. I hope baby cooperates. I hopefully find out mondat this is my second :-) goold luck
18 to 20 weeks for accuracy!(: